1 | // SPDX-License-Identifier: GPL-2.0-only |
---|---|
2 | /* |
3 | * Copyright (C) 2012 Synopsys, Inc. (www.synopsys.com) |
4 | * |
5 | * Based on reduced version of METAG |
6 | */ |
7 | |
8 | |
9 | #include <linux/init.h> |
10 | #include <linux/reboot.h> |
11 | #include <linux/memblock.h> |
12 | #include <linux/of.h> |
13 | #include <linux/of_fdt.h> |
14 | #include <asm/mach_desc.h> |
15 | #include <asm/serial.h> |
16 | |
17 | #ifdef CONFIG_SERIAL_EARLYCON |
18 | |
19 | static unsigned int __initdata arc_base_baud; |
20 | |
21 | unsigned int __init arc_early_base_baud(void) |
22 | { |
23 | return arc_base_baud/16; |
24 | } |
25 | |
26 | static void __init arc_set_early_base_baud(unsigned long dt_root) |
27 | { |
28 | if (of_flat_dt_is_compatible(node: dt_root, name: "abilis,arc-tb10x")) |
29 | arc_base_baud = 166666666; /* Fixed 166.6MHz clk (TB10x) */ |
30 | else if (of_flat_dt_is_compatible(node: dt_root, name: "snps,arc-sdp") || |
31 | of_flat_dt_is_compatible(node: dt_root, name: "snps,hsdk")) |
32 | arc_base_baud = 33333333; /* Fixed 33MHz clk (AXS10x & HSDK) */ |
33 | else |
34 | arc_base_baud = 50000000; /* Fixed default 50MHz */ |
35 | } |
36 | #else |
37 | #define arc_set_early_base_baud(dt_root) |
38 | #endif |
39 | |
40 | static const void * __init arch_get_next_mach(const char *const **match) |
41 | { |
42 | static const struct machine_desc *mdesc = __arch_info_begin; |
43 | const struct machine_desc *m = mdesc; |
44 | |
45 | if (m >= __arch_info_end) |
46 | return NULL; |
47 | |
48 | mdesc++; |
49 | *match = m->dt_compat; |
50 | return m; |
51 | } |
52 | |
53 | /** |
54 | * setup_machine_fdt - Machine setup when an dtb was passed to the kernel |
55 | * @dt: virtual address pointer to dt blob |
56 | * |
57 | * If a dtb was passed to the kernel, then use it to choose the correct |
58 | * machine_desc and to setup the system. |
59 | */ |
60 | const struct machine_desc * __init setup_machine_fdt(void *dt) |
61 | { |
62 | const struct machine_desc *mdesc; |
63 | unsigned long dt_root; |
64 | |
65 | if (!early_init_dt_scan(params: dt)) |
66 | return NULL; |
67 | |
68 | mdesc = of_flat_dt_match_machine(NULL, get_next_compat: arch_get_next_mach); |
69 | if (!mdesc) |
70 | machine_halt(); |
71 | |
72 | dt_root = of_get_flat_dt_root(); |
73 | arc_set_early_base_baud(dt_root); |
74 | |
75 | return mdesc; |
76 | } |
77 |